cmd/internal/gc: omit non-explicit capacity in errors with map/chan make

Fixes #9083.

Change-Id: Ifbdebafb39a73a1dacf7e67171e8e88028d1f10b
Reviewed-on: https://go-review.googlesource.com/1219
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: Chris Manghane <cmang@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/test/fixedbugs/issue9083.go b/test/fixedbugs/issue9083.go
new file mode 100644
index 0000000..c92c0a6
--- /dev/null
+++ b/test/fixedbugs/issue9083.go
@@ -0,0 +1,22 @@
+// errorcheck
+
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Issue 9083: map/chan error messages show non-explicit capacity.
+
+package main
+
+// untyped constant
+const zero = 0
+
+func main() {
+	var x int
+	x = make(map[int]int) // ERROR "cannot use make\(map\[int\]int\)|incompatible"
+	x = make(map[int]int, 0) // ERROR "cannot use make\(map\[int\]int, 0\)|incompatible"
+	x = make(map[int]int, zero) // ERROR "cannot use make\(map\[int\]int, zero\)|incompatible"
+	x = make(chan int) // ERROR "cannot use make\(chan int\)|incompatible"
+	x = make(chan int, 0) // ERROR "cannot use make\(chan int, 0\)|incompatible"
+	x = make(chan int, zero) // ERROR "cannot use make\(chan int, zero\)|incompatible"
+}